In my experience, you should go with the Canon RF 14-35mm f/4L IS USM. Honestly, I spent years lugging around primes before trying the Canon RF 16mm f/2.8 STM, but I was pretty disappointed with the heavy distortion and soft corners on my R8. It's portable, but the quality just isn't there for serious architecture. The 14-35mm is definitely the better value for sharpness, even if it's pricier. Hope this helps!

Curious about one thing: what's your actual budget for this? I'm asking because there's a MASSIVE price gap between those two. Honestly, the Canon RF 16mm f/2.8 STM is around $300, while the Canon RF 14-35mm f/4L IS USM is usually over $1,200. It's hard to compare them fairly!

If you're looking for a middle ground, here are some technical thoughts:

- Canon RF 15-30mm f/4.5-6.3 IS STM: This is way cheaper than the L-series but offers more flexibility than the prime. It's a decent option if you're okay with a slower aperture.
- Canon RF 16mm f/2.8 STM: It's super light, but like the previous reply said, the distortion is real. It relies heavily on in-camera corrections.

Let me know your budget range so I can give better advice. Hope this helps!

In my experience, picking a wide-angle lens really comes down to how you plan to balance optical physics with your wallet. Ultra-wide lenses like these often struggle with distortion and vignetting because of how they bend light to fit the frame, and the way a camera handles that determines the value.

If you're looking for the best bang for your buck, I believe the Canon RF 16mm f/2.8 STM is a decent option for casual hiking because it's so light, but honestly, it relies heavily on in-camera software to fix its massive distortion. On the other hand, the Canon RF 14-35mm f/4L IS USM is a total beast for architecture because it stays sharp across the frame. It's MUCH more expensive, but for serious work on the R8, teh quality jump is definitely noticeable. If you're on a budget, maybe look at the Canon RF 15-30mm f/4.5-6.3 IS STM as a middle ground? It works well without breaking the bank. Hope this helps!

@Reply #5 - good point! Raymond is totally right. Honestly, I would suggest just going with any of the entry-level wide zooms from Canon. You really cant go wrong with their budget glass for a body like the R8. It keeps the whole kit light which is kind of the point of that camera anyway. Just be careful tho... some of those lenses have some pretty wild distortion that the camera hides automatically. If you're a DIY type who likes to mess with RAW files, you might want to consider how much time you wanna spend fixing lens profiles in post. Make sure to look into that before pulling the trigger, but for real-world shots, the cheaper glass is usually plenty sharp enough if you stop it down a bit. I'm always around if you need help figuring out the software side of things later on.

Building on the earlier suggestion, I've spent a lot of time with both these lenses on my R8 and honestly... I've been kinda let down. I really wanted to love the Canon RF 16mm f/2.8 STM for its size, but unfortunately it just had issues with corner sharpness that ruined a few of my favorite landscape shots from a trip last year. It felt like I was losing way too much detail after the camera fixed the distortion. Even the Canon RF 14-35mm f/4L IS USM was not as good as expected for the price. It's a great lens, dont get me wrong, but for over $1,200 it relies way too much on digital corrections to hide the vignetting at the wide end. It almost feels like cheating for an L-series lens. Quick question tho, are you mostly shooting handheld or are you lugging a tripod around for these architecture shots? If you're okay with a slower aperture, you might actually be happier with the Canon RF 15-30mm f/4.5-6.3 IS STM. It's around $500 and feels like a much more honest balance for the R8 body, even if it's not quite as wide as the L glass. Let me know your setup and I can give better specifics.

Same boat, watching this

Ok adding this to my list of things to try. Thanks for the tip!

This ^

100% agree

I picked up the Canon RF 16mm f/2.8 STM a few months back for my R8 thinking it would be the ultimate light setup for hiking. Unfortunately, I was pretty let down. The barrel distortion is just wild... if you look at the RAW files without the camera's auto-corrections, it barely covers the full sensor. By the time the software stretches the image to fit, those corners are basically useless for architecture. It's not as good as I expected for a native prime. Honestly, I've had better results using an adapter with older glass like the Canon EF 16-35mm f/4L IS USM. It's heavier, but the optics are actually solid without needing digital wizardry to fix physics. If you're stuck on native RF and can't afford the Canon RF 14-35mm f/4L IS USM, just be ready to deal with some soft edges. For landscapes where you want every needle on a tree to be sharp, the 16mm is gonna frustrate you. It's a shame because the R8 sensor deserves better than what some of these budget RF lenses are putting out.